9.10.2 Self-Check on Looking for Relationships

Tick iconExercise 2: Writing a Word Formula

a) A pedometer counts the number of steps that you take over a given time period but you want to work out how far you have walked in yards.  If your normal stride length is 0.75 yards write down a word formula that will allow you to calculate for any given number of steps how far you have walked.

Solutions icon

Answer

a) Distance walked in yards equals number of steps prefix multiplication of 0.75.

b) Your electricity is charged at 15 cents per unit with a monthly standing charge of $2.50.  Write a word formula that allows you to calculate your annual electricity bill in dollars.

Solutions icon

Answer

b) Annual electricity bill in dollars equals number of units prefix multiplication of 0.15 postfix plus dollar 30.

9.10.1 Self-Check on Exploring Patterns and Processes

9.10.3 Self-Check on Using Formulas